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Experiments using sub-wavelength diameter tapered optical fibers in rubidium vapor.

机译：在using蒸气中使用亚波长直径的锥形光纤进行实验。

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摘要

In this work, we describe experimental research on a relatively new nonlinear optics system comprised of a sub-wavelength diameter Tapered Optical Fiber (TOF) suspended in atomic Rubidium (Rb) vapor. The compression of the evanescent optical mode propagating along the TOF enables a dramatic increase in the nonlinear interactions between the fields and the surrounding Rb atoms, thereby allowing the observation of a variety of nonlinear optical effects with very low-power fields. Specifically, we report on the observation of saturated absorption with nW power levels and, more significantly, the observation of two-photon absorption using power-levels corresponding to only 10's to 100's of photons interacting with the Rb atoms at a given time.;One significant drawback to this "TOF in Rb" system is that at the relatively high atomic densities needed for many of these experiments, Rb atoms accumulating on the TOF surface can cause a significant loss of overall transmission through the fiber. Here we report direct measurements of the time-scale associated with this transmission degradation for various Rb density conditions. We find that transmission is affected almost immediately after the introduction of Rb vapor into the system, and declines rapidly as the density is increased.;More significantly, we show how a heating element designed to raise the TOF temperature can be used to reduce this transmission loss and dramatically extend the effective TOF transmission lifetime. Our results indicate that it is possible to achieve relatively high TOF transmission, even in the presence of the relatively high Rb vapor densities that would be needed for many low-power nonlinear optics applications. This study represents a significant step in moving the basic "TOF in Rb" system from a laboratory setting towards a practical ultra-low-power nonlinear optics device.
机译：在这项工作中，我们描述了一个相对新颖的非线性光学系统的实验研究，该系统由悬浮在原子Rub（Rb）蒸气中的亚波长直径的锥形光纤（TOF）组成。沿TOF传播的e逝光学模式的压缩可以显着增加场与周围Rb原子之间的非线性相互作用，从而可以观察到具有非常低功率场的各种非线性光学效应。具体来说，我们报告了在nW功率水平下观察到的饱和吸收的观察结果，更重要的是，在给定时间使用与Rb原子相互作用的光子只有10到100的功率水平观察到了双光子吸收的观察结果。这种“ Rb中的TOF”系统的主要缺点是，在许多这些实验所需的相对较高的原子密度下，聚集在TOF表面的Rb原子会导致通过光纤的整体传输效率显着下降。在这里，我们报告了在各种Rb密度条件下与这种传输劣化相关的时间尺度的直接测量。我们发现在将Rb蒸气引入系统后，传输几乎立即受到影响，并且随着密度的增加而迅速下降。;更重要的是，我们展示了如何使用设计用于提高TOF温度的加热元件来减少这种传输。损耗并大大延长了有效TOF传输寿命。我们的结果表明，即使存在许多低功率非线性光学应用所需的相对较高的Rb蒸气密度，也可以实现较高的TOF透射率。这项研究代表了将基本的“ TOF in Rb”系统从实验室环境向实用的超低功率非线性光学器件迈出的重要一步。

著录项

  • 作者

    Lai, Meimei.;

  • 作者单位

    University of Maryland, Baltimore County.;

  • 授予单位 University of Maryland, Baltimore County.;
  • 学科 Physics Quantum.;Physics Optics.;Physics Atomic.
  • 学位 Ph.D.
  • 年度 2013
  • 页码 147 p.
  • 总页数 147
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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